From 957c64c7b8b5e98d8a03dd84c7e27e7991fb9dbc Mon Sep 17 00:00:00 2001
From: iamcheeseman <dev@iamcheeseman.net>
Date: Mon, 6 Apr 2026 17:04:05 -0400
Subject: Initial commit

---
 common/mem.c | 200 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 200 insertions(+)
 create mode 100644 common/mem.c

(limited to 'common/mem.c')

diff --git a/common/mem.c b/common/mem.c
new file mode 100644
index 0000000..4196812
--- /dev/null
+++ b/common/mem.c
@@ -0,0 +1,200 @@
+#include "mem.h"
+
+#include <GLFW/glfw3.h>
+
+#include "common.h"
+#include "dyn_arr.h"
+
+// Array to track temp allocations.
+void **temp_allocations;
+
+#ifdef UE_DEBUG
+
+#include <execinfo.h>
+
+#define BACKTRACE_SIZE 16
+
+struct alloc {
+        void *ptr;
+        size_t size;
+        int backtrace_len;
+        char **backtrace;
+};
+
+int allocations_cap;
+int allocations_len;
+struct alloc *allocations;
+
+#endif // UE_DEBUG
+
+static
+void *glfw_alloc(size_t size, void *user)
+{
+        (void)user;
+        return mem_alloc(size);
+}
+
+static
+void *glfw_realloc(void *block, size_t size, void *user)
+{
+        (void)user;
+        return mem_realloc(block, size);
+}
+
+static
+void glfw_dealloc(void *block, void *user)
+{
+        (void)user;
+        mem_free(block);
+}
+
+void init_mem(void)
+{
+#ifdef UE_DEBUG
+        allocations_len = 0;
+        allocations_cap = 8;
+        allocations = malloc(sizeof(struct alloc) * 8);
+        if (!allocations)
+                log_fatal(ERR_MEM, "(%s) (track) ran out of memory", __func__);
+#endif // UE_DEBUG
+
+        GLFWallocator glfw_allocator;
+        glfw_allocator.allocate = glfw_alloc;
+        glfw_allocator.reallocate = glfw_realloc;
+        glfw_allocator.deallocate = glfw_dealloc;
+        glfwInitAllocator(&glfw_allocator);
+
+        temp_allocations = da_create(void*, 0);
+}
+
+void deinit_mem(void)
+{
+        da_free(temp_allocations);
+#ifdef UE_DEBUG
+        fprintf(stderr, "%d allocations leaked\n", allocations_len);
+        for (int i = 0; i < allocations_len; i++) {
+                struct alloc *alloc = &allocations[i];
+                fprintf(
+                        stderr,
+                        "leaked %zu bytes at %p\n",
+                        alloc->size,
+                        alloc->ptr
+                );
+                for (int j = 0; j < alloc->backtrace_len; j++) {
+                        fprintf(stderr, "\t%s\n", alloc->backtrace[j]);
+                }
+                putc('\n', stderr);
+
+                free(alloc->backtrace);
+        }
+        free(allocations);
+
+        if (allocations_len > 0)
+                exit(ERR_MEM_LEAK);
+#endif // UE_DEBUG
+}
+
+void free_temp_allocs(void)
+{
+        for (int i = 0; i < da_len(temp_allocations); i++) {
+                void *temp = temp_allocations[i];
+                mem_free(temp);
+        }
+        da_clear(temp_allocations);
+}
+
+void *mem_alloc(size_t size)
+{
+        void *ptr = malloc(size);
+        if (!ptr)
+                log_fatal(ERR_MEM, "(%s) ran out of memory", __func__);
+
+#ifdef UE_DEBUG
+        // Log allocation
+        struct alloc alloc;
+        void *bt[BACKTRACE_SIZE];
+        int bt_len = backtrace(bt, BACKTRACE_SIZE);
+        char **symbols = backtrace_symbols(bt, bt_len);
+
+        alloc.ptr = ptr;
+        alloc.size = size;
+        alloc.backtrace_len = bt_len;
+        alloc.backtrace = symbols;
+
+        if (allocations_len + 1 > allocations_cap) {
+                allocations_cap *= 2;
+                allocations = realloc(
+                        allocations,
+                        sizeof(struct alloc) * allocations_cap
+                );
+                if (!allocations)
+                        log_fatal(
+                                ERR_MEM,
+                                "(%s) (track) ran out of memory",
+                                __func__
+                        );
+        }
+
+        allocations[allocations_len++] = alloc;
+#endif // UE_DEBUG
+
+        return ptr;
+}
+
+void *mem_realloc(void *ptr, size_t new_size)
+{
+        if (new_size == 0) {
+                mem_free(ptr);
+                return NULL;
+        }
+
+        void *new_ptr = realloc(ptr, new_size);
+        if (!new_ptr)
+                log_fatal(ERR_MEM, "(%s) ran out of memory", __func__);
+
+#ifdef UE_DEBUG
+        for (int i = 0; i < allocations_len; i++) {
+                struct alloc *alloc = &allocations[i];
+                if (alloc->ptr == ptr) {
+                        alloc->ptr = new_ptr;
+                        alloc->size = new_size;
+                        break;
+                }
+        }
+#endif // UE_DEBUG
+
+        return new_ptr;
+}
+
+void *mem_talloc(size_t size)
+{
+        void *ptr = mem_alloc(size);
+        da_append(void*, &temp_allocations, ptr);
+        return ptr;
+}
+
+void mem_free(void *ptr)
+{
+        free(ptr);
+
+#ifdef UE_DEBUG
+        for (int i = 0; i < allocations_len; i++) {
+                struct alloc *alloc = &allocations[i];
+                if (alloc->ptr == ptr) {
+                        free(alloc->backtrace);
+                        *alloc = allocations[allocations_len - 1];
+                        allocations_len--;
+                        break;
+                }
+        }
+#endif // UE_DEBUG
+}
+
+int alloc_count(void)
+{
+#ifdef UE_DEBUG
+        return allocations_len;
+#else
+        return -1;
+#endif
+}
-- 
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